Modular PRB repair method with environmental risk management and control function

Abstract

The invention belongs to the technical field of groundwater pollution remediation. The invention specifically discloses a modular PRB repair method with an environmental risk management and control function. A funnel-water guide gate type permeable reactive barrier is arranged between a contaminated site and a downstream protection target; hexagonal prism detachable medium modules are arranged inthe reaction wall; monitoring wells are arranged on the front side face, the rear side face and the side face of the reactive barrier; when monitored water quality data do not meet the design requirement, an emergency treatment system is started, and substandard underground water near the permeable reactive barrier is pumped to the emergency treatment system to be treated and then recharged to theupstream of the reactive barrier. The objective is to monitor the water quality condition near the permeable reactive barrier in real time through an underground water monitoring system, and operation and management personnel can master the operation condition of the reactive barrier at any time, so that a PRB active material for filling use can be utilized to the greatest extent, the resource waste caused by premature replacement or supplementation of the active material is avoided, and the cost is reduced while the PRB operation safety is ensured.

Description

technical field [0001] The invention relates to the technical field of groundwater pollution restoration, in particular to a modularized PRB restoration method with environmental risk management and control functions. Background technique [0002] Groundwater is a precious water resource in our country. Recent monitoring data show that the groundwater in the country is generally polluted, and the water quality in some areas is seriously exceeding the standard. The scope of groundwater pollution continues to expand, and the degree of pollution continues to deepen. The polluted groundwater in some areas is also used as a source of drinking water, seriously affecting the safety of the people. Therefore, it is particularly important to carry out groundwater pollution remediation work. [0003] The current groundwater remediation technologies mainly include monitoring natural attenuation technology, ex-situ treatment technology for groundwater pollution, and in-situ remediation...

AI Technical Summary

Problems solved by technology

However, there are also the following problems in the application of PRB technology: (1) The medium capacity of the permeable reaction wall is limited, and the active material in the wall needs to be replaced after working for a period of time to ensure the treatment efficiency; however, if the reaction wall medium is replaced prematurely, the reaction medium If the activity is not fully exerted, it will cause a waste of resources and an increase in operating costs; if the medium is not replaced in time, the groundwater that is not treated up to the standard will enter the downstream, causing environmental pollution problems; (2) The replacement of the reaction medium of the permeable reaction wall is not enough It is convenient, and the reaction medium cannot be quickly replaced according to the actual use requirements, which affects the effective working time of the permeable reaction wall; (3) The interaction between the pollutants in the groundwater and the active medium in the reaction wall will cause material precipitation and blockage in the reaction wall, The flow field of the groundwater in the reaction wall and its vicinity changes, causing the polluted groundwater to bypass or overflow the reaction wall, polluting the downstream groundwater and the environment, so that the purification of the groundwater cannot be guaranteed

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